SimplexGrinnell 2098-9537 Air Duct Smoke Detector

The SimplexGrinnell 2098-9537 air duct smoke detector is a duct-mounted device for commercial HVAC fire protection systems, designed to detect smoke within ventilation ducts and initiate alarm or equipment shutdown. Weighing 6.45 lb and housed in a flame-retardant enclosure, it uses an air sampling tube to monitor smoke at operating air velocities from 300 to 4000 ft/min, with installation type specified as duct mounting and compatibility with air handling units and ventilation systems. It is intended for commercial and industrial facilities, including ventilation networks and life-safety installations, and it aligns with NFPA duct smoke detection requirements to support reliable monitoring integrated with building management systems. Common replacements include Simplex 2098-9648, System Sensor D4120, and Simplex 4098-9756, making it suitable for repair, retrofit, expansion, or replacement within existing SimplexGrinnell HVAC fire protection networks.